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Raffinement de maillage multi-grille local en vue de la simulation 3D du combustible nucléaire des Réacteurs à Eau sous Pression

Lauréline Barbié 1, 2 
1 LSC - Laboratoire de Simulation du Comportement des Combustibles
SESC - Service d'Etudes de Simulation du Comportement du combustibles : DEN/DEC/SESC
Abstract : The aim of this study is to improve the performances, in terms of memory space and computational time, of the current modelling of the Pellet-Cladding mechanical Interaction (PCI), complex phenomenon which may occurs during high power rises in pressurised water reactors. Among the mesh refinement methods - methods dedicated to efficiently treat local singularities - a local multi-grid approach was selected because it enables the use of a black-box solver while dealing few degrees of freedom at each level. The Local Defect Correction (LDC) method, well suited to a finite element discretisation, was first analysed and checked in linear elasticity, on configurations resulting from the PCI, since its use in solid mechanics is little widespread. Various strategies concerning the implementation of the multilevel algorithm were also compared. Coupling the LDC method with the Zienkiewicz-Zhu a posteriori error estimator in order to automatically detect the zones to be refined, was then tested. Performances obtained on twodimensional and three-dimensional cases are very satisfactory, since the algorithm proposed is more efficient than h-adaptive refinement methods. Lastly, the LDC algorithm was extended to nonlinear mechanics. Space/time refinement as well as transmission of the initial conditions during the remeshing step were looked at. The first results obtained are encouraging and show the interest of using the LDC method for PCI modelling.
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https://tel.archives-ouvertes.fr/tel-00926550
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Submitted on : Wednesday, February 12, 2014 - 3:24:19 PM
Last modification on : Tuesday, October 19, 2021 - 10:59:08 PM
Long-term archiving on: : Monday, May 12, 2014 - 11:30:12 PM

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  • HAL Id : tel-00926550, version 2

Citation

Lauréline Barbié. Raffinement de maillage multi-grille local en vue de la simulation 3D du combustible nucléaire des Réacteurs à Eau sous Pression. Mécanique des solides [physics.class-ph]. Aix-Marseille Université, 2013. Français. ⟨tel-00926550v2⟩

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